Flotation method for improving recovery value of gold and silver in lead-zinc-gold and silver ore

Abstract

The invention provides a flotation method for improving the recovery value of gold and silver in lead-zinc gold and silver ore, the method comprises the following steps: grinding lead-zinc raw ore to obtain ore pulp, and then adding zinc sulfate, a lead collecting agent HQ77 and ethyl xanthate to carry out lead-sulfur mixed roughing flotation; adding sodium humate, sodium sulfite and the lead collecting agent HQ77 into concentrate obtained through lead-sulfur mixed roughing for lead-sulfur separation roughing, performing first lead concentration on the concentrate obtained through lead-sulfur separation roughing, and performing first lead-sulfur separation scavenging on tailings obtained through lead-sulfur separation roughing; enabling the tailings of the first-time lead-sulfur separation scavenging to be subjected to second-time lead-sulfur separation scavenging or concentrated and filter-pressed to obtain a sulfur concentrate product; carrying out lead-sulfur mixed scavenging on the tailings obtained by lead-sulfur mixed roughing; and enabling the tailings of the first lead-sulfur mixed scavenging to be subjected to second lead-sulfur mixed scavenging or used as the selected ore pulp for zinc selection operation. In the lead-sulfur flotation process, gold and silver are preferentially enriched in the lead-sulfur bulk concentrate, and the content of gold and silver in the lead-sulfur bulk concentrate is low. The gold and silver recovery value of the lead-zinc gold and silver ore is greatly improved.

Description

technical field [0001] The invention relates to a new lead-zinc beneficiation process for sorting lead-zinc gold-silver ore, in particular to a flotation method for improving the gold and silver recovery value of lead-zinc gold-silver ore. Background technique [0002] Among the beneficiation products of lead-zinc ore rich in gold and silver, the valuation coefficient of gold and silver in lead concentrate is above 85%. About 50% of gold in sulfur concentrate is priced, and silver is not priced. Gold in zinc concentrate is not priced, and the price coefficient of silver is about 20%. How to improve the recovery rate of gold and silver in lead concentrate and reduce the gold and silver content in zinc concentrate is the key to improving the value of gold and silver in lead-zinc gold-silver ore. At present, conventional lead-zinc beneficiation processes mainly include priority flotation process, mixed flotation process, equal flotation process, asynchronous flotation process...

AI Technical Summary

Problems solved by technology

[0003] Whether it is lead-zinc priority flotation or lead-zinc mixed flotation, there is still about 60% gold content in the slurry system during the zinc selection operation, and the zinc selection operation under this environment will inevitably enrich part of the gold minerals to the zinc In the concentrate, the gold content in the zinc concentrate is high

Images